[PATCH -next] hid-example: fix some build issues

[Randy Dunlap <randy.dunlap@oracle.com>]

From: Randy Dunlap <randy.dunlap@oracle.com>

samples/hid-example.o needs some Kconfig and Makefile additions
in order to build.  It should use <linux/*.h> headers from
the build tree, so use HEADERS_CHECK to require that those
header files be present.

Change the kconfig symbol from tristate to bool since
userspace cannot be built as loadable modules.

However, I don't understand why the userspace header files are
not present as reported in Andrew's build log, since it builds
OK on x86_64 without any of these changes.

Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Alan Ott <alan@signal11.us>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: linux-input@vger.kernel.org
---
 samples/Kconfig         |    4 ++--
 samples/hidraw/Makefile |    2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

--- linux-next-20110418.orig/samples/hidraw/Makefile
+++ linux-next-20110418/samples/hidraw/Makefile
@@ -6,3 +6,5 @@ hostprogs-y := hid-example
 
 # Tell kbuild to always build the programs
 always := $(hostprogs-y)
+
+HOSTCFLAGS_hid-example.o += -I$(objtree)/usr/include
--- linux-next-20110418.orig/samples/Kconfig
+++ linux-next-20110418/samples/Kconfig
@@ -62,8 +62,8 @@ config SAMPLE_KDB
 	  command to the kdb shell.
 
 config SAMPLE_HIDRAW
-	tristate "Build simple hidraw example"
-	depends on HIDRAW
+	bool "Build simple hidraw example"
+	depends on HIDRAW && HEADERS_CHECK
 	help
 	  Build an example of how to use hidraw from userspace.